Buggy code:
, new double [ ] { 5 } } ; protected double [ ] [ ] subColumn3 = new double [ ] [ ] { new double [ ] { 4 } , new double [ ] { 4.5 } , new double [ ] { 8 } , new double [ ] { 7 } } ; protected double entryTolerance = 1.0E-15 ; protected double normTolerance = 1.0E-13 ; public RealMatrixImplTest ( String name ) { } public void setUp ( ) { } public static Test suite ( ) { } public void testDimensions ( ) { } public void testCopyFunctions ( ) { } public void testAdd ( ) { } public void testAddFail ( ) { } public void testNorm ( ) { } public void testFrobeniusNorm ( ) { } public void testPlusMinus ( ) { } public void testMultiply ( ) { } private double [ ] [ ] d3 = new double [ ] [ ] { new double [ ] { 1 , 2 , 3 , 4 } , new double [ ] { 5 , 6 , 7 , 8 } } ; private double [ ] [ ] d4 = new double [ ] [ ] { new double [ ] { 1 } , new double [ ] { 2 } , new double [ ] { 3 } , new double [ ] { 4 } } ; private double [ ] [ ] d5 = new double [ ] [ ] { new double [ ] { 30 } , new double [ ] { 70 } } ; public void testMultiply2 ( ) { } public void testTrace ( ) { } public void testScalarAdd ( ) { } public void testOperate ( ) { } public void testMath209 ( ) { } public void testTranspose ( ) { } public void testPremultiplyVector ( ) { } public void testPremultiply ( ) { } public void testGetVectors ( ) { } public void testGetEntry ( ) { } public void testExamples ( ) { } public void testGetSubMatrix ( ) { } private void checkGetSubMatrix ( RealMatrix m , double [ ] [ ] reference , int startRow , int endRow , int startColumn , int endColumn , boolean mustFail ) { } private void checkGetSubMatrix ( RealMatrix m , double [ ] [ ] reference , int [ ] selectedRows , int [ ] selectedColumns , boolean mustFail ) { } public void testCopySubMatrix ( ) { } private void checkCopy ( RealMatrix m , double [ ] [ ] reference , int startRow , int endRow , int startColumn , int endColumn , boolean mustFail ) { } private void checkCopy ( RealMatrix m , double [ ] [ ] reference , int [ ] selectedRows , int [ ] selectedColumns , boolean mustFail ) { } public void testGetRowMatrix ( ) { } public void testSetRowMatrix ( ) { } public void testGetColumnMatrix ( ) { } public void testSetColumnMatrix ( ) { } public void testGetRowVector ( ) { } public void testSetRowVector ( ) { } public void testGetColumnVector ( ) { } public void testSetColumnVector ( ) { } private RealVector columnToVector ( double [ ] [ ] column ) { } public void testGetRow ( ) { } public void testSetRow ( ) { } public void testGetColumn ( ) { } public void testSetColumn ( ) { } private double [ ] columnToArray ( double [ ] [ ] column ) { } private void checkArrays ( double [ ] expected , double [ ] actual ) { } public void testEqualsAndHashCode ( ) { } public void testToString ( ) { } public void testSetSubMatrix ( ) throws Exception { } public void testWalk ( ) { } private static class SetVisitor extends DefaultRealMatrixChangingVisitor { private static final long serialVersionUID = - 5082825244208703349L ; public double visit ( int i , int j , double value ) { } } private static class GetVisitor extends DefaultRealMatrixPreservingVisitor { private static final long serialVersionUID = 849639072339030818L ; private int count = 0 ; public void visit ( int i , int j , double value ) { } public int getCount ( ) { } } protected void splitLU ( RealMatrix lu , double [ ] [ ] lowerData , double [ ] [ ] upperData ) throws InvalidMatrixException { if ( ( ( ( ( ! ( lu . isSquare ( ) ) ) || ( ( lowerData . length ) != ( lowerData [ 0 ] . length ) ) ) || ( ( upperData . length ) != ( upperData [ 0 ] . length ) ) ) || ( ( lowerData . length ) != ( upperData . length ) ) ) || ( ( lowerData . length ) != ( lu . getRowDimension ( ) ) ) ) { <START_BUG> throw new InvalidMatrixException ( "incorrect<seq2seq4repair_space>dimensions" , null ) ; <END_BUG> } int n = lu . getRowDimension ( ) ; for ( int i = 0 ; i < n ; i ++ ) { for ( int j = 0 ; j < n ; j ++ ) { if ( j < i ) { lowerData [ i ] [ j ] = lu . getEntry ( i , j ) ; upperData [ i ] [ j ] = 0.0 ; } else if ( i == j ) { lowerData [ i ] [ j ] = 1.0 ; upperData [ i ] [ j ] = lu . getEntry ( i , j ) ; } else { lowerData [ i ] [ j ] = 0.0 ; upperData [ i ] [ j ] = lu . getEntry ( i , j ) ; } } } } protected RealMatrix permuteRows ( RealMatrix matrix , int [ ] permutation ) { } }

Fix:
throw new InvalidMatrixException ( "incorrect<seq2seq4repair_space>dimensions" ) ;